Cloud Stalker: TROPICAL STORM EDOUARD

Sunday, August 3, 2008

TROPICAL STORM EDOUARD

000
WTNT35 KNHC 032348
TCPAT5
BULLETIN
TROPICAL STORM EDOUARD INTERMEDIATE ADVISORY NUMBER 2A
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL052008
700 PM CDT SUN AUG 03 2008

...EDOUARD MOVING SLOWLY WESTWARD...HURRICANE WATCHES OR WARNINGS
MAY BE REQUIRED LATER TONIGHT...

A TROPICAL STORM WARNING REMAINS IN EFFECT FOR THE LOUISIANA COAST
FROM THE MOUTH OF THE MISSISSIPPI RIVER WESTWARD TO INTRACOASTAL
CITY. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS
ARE EXPECTED WITHIN THE WARNING AREA WITHIN THE NEXT 24 HOURS.

A TROPICAL STORM WATCH REMAINS IN EFFECT WEST OF INTRACOASTAL CITY
TO PORT OCONNOR TEXAS. A TROPICAL STORM WATCH MEANS THAT TROPICAL
STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY
WITHIN 36 HOURS.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA...INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS...PLEASE MONITOR PRODUCTS ISSUED
BY YOUR LOCAL WEATHER OFFICE.

AT 700 PM CDT...0000Z...THE CENTER OF TROPICAL STORM EDOUARD WAS
LOCATED NEAR LATITUDE 28.1 NORTH...LONGITUDE 88.2 WEST OR ABOUT 90
MILES...145 KM...SOUTHEAST OF THE MOUTH OF THE MISSISSIPPI RIVER AND
ABOUT 415 MILES...670 KM...EAST-SOUTHEAST OF GALVESTON TEXAS.

EDOUARD IS MOVING TOWARD THE WEST NEAR 4 MPH...6 KM/HR...AND
A GENERAL MOTION TOWARD THE WEST OR WEST-NORTHWEST IS FORECAST
DURING THE NEXT COUPLE OF DAYS. ON THE FORECAST TRACK...THE CENTER
OF THE CYCLONE WILL MOVE PARALLEL TO THE LOUISIANA COAST TONIGHT
AND MONDAY...AND BE VERY NEAR THE COAST OF SOUTHWESTERN LOUISIANA OR
THE UPPER TEXAS COAST ON TUESDAY.

MAXIMUM SUSTAINED WINDS ARE NEAR 50 MPH...85 KM/HR...WITH HIGHER
GUSTS. SOME ADDITIONAL STRENGTHENING IS FORECAST DURING THE NEXT 24
HOURS...AND EDOUARD COULD BE NEARING HURRICANE STRENGTH BEFORE
LANDFALL.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 35 MILES...55 KM
FROM THE CENTER.

THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY RECONNAISSANCE
AIRCRAFT WAS 1002 MB...29.59 INCHES.

STORM SURGE OF 2 TO 4 FT ABOVE NORMAL TIDE LEVELS CAN BE EXPECTED IN
THE WARNING AREA IN AREAS OF ONSHORE FLOW.

EDOUARD IS EXPECTED TO PRODUCE TOTAL RAIN ACCUMULATIONS OF 1 TO 2
INCHES ALONG THE THE LOUISIANA COAST WITH POSSIBLE ISOLATED MAXIMUM
AMOUNTS OF 3 INCHES. ONCE THE SYSTEM MOVES TO THE UPPER TEXAS
COAST...TOTAL RAIN ACCUMULATIONS OF 2 TO 4 INCHES WITH ISOLATED
MAXIMUM AMOUNTS OF 6

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HAIL (3/4 inch or greater)

Hail can cause significant damage to your vehicle, break windows and damage roofs of homes and businesses.
Hail can cause significant bodily injuries such as broken bones and even blindness if wind blown.
Softball (4.5 inches) sized hail was reported in Lake Wales, Florida on March 30, 1996.
Haildrifts, up to four feet deep of dime to nickel sized hail, occurred in low-lying areas near Zephyrhills, Florida on January 29, 1997.
Hailstones the size of softballs can fall at speeds faster than 100 mph

supercell

Supercells derive their rotation through tilting of horizontal vorticity (an invisible horizontal vortex) caused by wind shear. Strong updrafts lift the air turning about a horizontal axis and cause this air to turn about a vertical axis. This forms the deep rotating updraft, the mesocyclone.
A cap or capping inversion is usually required to form a downdraft of sufficient strength. The cap puts an inverted (warm-above-cold) layer above a normal (cold-above-warm) boundary layer, and by preventing warm surface air from sinking too far, allows one or both of the following:
Air below the cap warms and/or becomes more moist
Air above the cap cools
This creates a warmer, moister layer below a cooler layer, which is increasingly unstable (because warm air is less dense and tends to rise). When the cap weakens or moves, explosive development follows.
In North America, supercells usually show up on Doppler radar as starting at a point or hook shape on the southwestern side, fanning out to the northeast. The heaviest precipitation is usually on the southwest side, ending abruptly short of the rain-free updraft base or main updraft (not visible to radar). The rear flank downdraft, or RFD, carries precipitation counterclockwise around the north and northwest side of the updraft base, producing a "hook echo" that indicates the presence of a mesocyclone.